Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1996-04-19
1997-12-30
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4435, 369 4432, G11B 7095
Patent
active
057038490
ABSTRACT:
In a tracking servo circuit for such as an optical disc device, and the like, a tracking error signal TE obtained in a servo-off state is subjected to A/D conversion, the center level thereof is calculated at a center level computation circuit, that value is stored in a register, at a time of servo-on, switches are connected to one terminal side, in the normal operation mode, the center level stored in the register is subtracted from the tracking error signal TE obtained at the time of the servo-on state at the subtraction circuit, the offset of the tracking error signal is corrected, and when light reflected from the surface of the disc can no longer be obtained due to an accidental cause, the connection of another switch is switched to the terminal b in response to the switching of the signal FOK generated based on the RF signal to the low level, and the offset correction operation of the tracking error signal TE is stopped.
REFERENCES:
patent: 5014256 (1991-05-01), Horie et al.
patent: 5151888 (1992-09-01), Shikichi et al.
patent: 5590103 (1996-12-01), Noda
Kananen Ronald P.
Sony Corporation
Tran Thang V.
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